package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =(HttpServletRequest) servletRequest;
        HttpServletResponse respone =(HttpServletResponse) servletResponse;
        //获取请求路径
        String uri = request.getRequestURI();
        //判断是否是登录请求,如果是,放行
        if(uri.contains("/login")){
            log.info("登录请求:{},放行", uri);
            filterChain.doFilter(request,respone);
            return;
        }
        //获取请求头中的token
        String jwt = request.getHeader("token");
        //判断是否有 token,如果没有,响应401状态码
        if(jwt ==null || jwt.isEmpty()){
            log.info("请求头中不存在token");
            respone.setStatus(401);
            return;
        }
        //解析token,如果解析失败,响应401状态码
        try{
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            respone.setStatus(401);
            return;
        }
        //放行
        log.info("放行");
        filterChain.doFilter(request,respone);

        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
